Bill Gates and Mark Zuckerberg are backing a controversial education program in East Africa

It involves each student learning at his or her own pace, generally through the aid of technology, and it’s beloved by tech billionaires like Bill Gates and Mark Zuckerberg.

But both Gates and Zuckerberg, in addition to other big names in Silicon Valley, also back an education model that is taking the opposite approach: pursuing learning gains with curricula standardized to each particular country.